Set up the test suite in Actions

.github/workflows/test.yml

@@ -0,0 +1,38 @@
+name: Tests
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    name: Test Suite
+    runs-on: ubuntu-latest
+
+    steps:
+
+    - name: Set up Node
+      uses: actions/setup-node@v1
+
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Cache dependencies
+      uses: actions/cache@v2
+      with:
+        path: ~/.npm 
+        key: ${{ runner.OS }}-npm-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.OS }}-npm-
+          ${{ runner.OS }}-
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Run test suite
+      run: npm test
+
+    - name: Collect coverage
+      run: npm run coverage